Official Ballot Release for STU 1

What's Changed

• Remove ballot note by @mrinnetmaki in #106
• Patient fixes by @Marvasuo in #111
• Add the explanation on Must Support rules by @mrinnetmaki in #112
• Fix file name and indentation by @mrinnetmaki in #113
• Add reference to Finnish Scheduling IG too by @mrinnetmaki in #114
• Quality assurance by @mrinnetmaki in #115
• Add contributors by @mikajylha in #119
• References to base profiles by @Marvasuo in #116
• procedure enhancements by @Marvasuo in #117
• Move diagnosis and reason for visit to new profile by @mikajylha in #118
• Fix wording in encounter by @mikajylha in #120
• Official ballot version by @mrinnetmaki in #110
• Polishing the version for ballot by @mrinnetmaki in #122

Full Changelog: v1.0.0-rc11...v1.0.0-rc15